Synthesis of
2-cinnamoyl-1-hydroxycarbazoles 2 by
the condensation of 1-hydroxycarbazoles with aluminium chloride and
phosphorousoxy chloride in good yield followed by acid catalysed cyclisation and
dehydrogenation with DDQ to obtain the biogenetically possible
2-phenyl-4-oxopyrano[2,3-]carbazoles
4 is described.

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